Joe Rocket Helmets Size Chart

RKT Speedmaster Carbon Helmet
Helmets
Size Hat Size Circumference
X-Small 6 5/8" - 6 3/4" 20 7/8" - 21 1/4"
Small 6 7/8" - 7" 21 5/8" - 22"
Medium 7 1/8" - 7 1/4" 22 1/2" - 22 7/8"
Large 7 3/8" - 7 1/2" 23 1/4" - 23 5/8"
X-Large 7 5/8" - 7 3/4" 24" - 24 3/8"
2X-Large 7 7/8" - 8" 24 3/4" - 25 1/4"

Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.